Manual latch for coreshaft box



Jan. 31, 1967 R. GREDING MANUAL LATCH FOR CORESHAFT BOX Filed Deo. 2l, 1964 5 Sheets-Sheet 1 N @Rx INVENTOR R. GREDING g/gf ATTOR NEYJ Jan. 31, R, GREDlNG MANUAL LATCH FOR CORESHAFT BOX 5 Sheets-Sheet 2 Filed Deo. 21, 1964 INVENTOR v R. GREDING ATTORNEYJ Jan. 31, 1967 R; GRn-:DING 3,301,498

MANUAIJ LATCH FOR coREsHAFT Box Filed Dec. 21, 1964 5 sheets-Sheet a INI/ENTOR R. GREDING TORNEYS United States Patent O 3,301,498 MANUAL LATCH FOR CORESHAFT BOX Robert Greding, Beaconsfield, Quebec, Canada, assigner to Dominion Engineering Works Limited, Montreal,

Quebec, Canada Filed Dec. 21, 1964, Ser. No. 419,987

4 claims. (cl. 242-66) This invention relates to winders and rewinders for paper machines and, more particularly, to improved manually operated latch mechanisms for releasably clamping coreshafts in Winder coreshaft bearing boxes.

A Winder, or more specifically a slitter-winder, is positioned at the dry end of 4a paper machine after the calender and reel, and comprises slitters and wind-up stand in one single unit. The function of a sli-tter-winder is t rewind the paper which has been wound by the reel and which contains breaks and rough edges, and also to slit the paper into the required widths. The paper is wound onto a coreshaft which has bearings at each end, the bearings being clamped in coreshaft boxes which are mounted, for vertical movement, on the vertical support frame of the Winder. Two driven drums are positioned beneath the coreshaft to support the roll of paper and to rotate the roll, by surface contact, at constan-t Winding speed.

Av rewinder is identical in construction to a Winder, except that a rewinder is usually much narrower in width. A rewinder usually operates in a paper finishing room, and is used for rewinding rolls which have been slit into comparatively narrow Widths on the Winder, and also for slitting them again into very narrow Widths. A rewinder is also used for rewinding rolls which have been damaged on the way to the finishing room, and for many other miscellaneous jobs.

It is the main object -of this invention to provide an improved manually operated latch mechanism for releasably clamping coreshaft bearings in coreshaft bearing boxes such that the coreshaft bearing housings will not rotate within the coreshaft boxes.

Conventional means for holding coreshafts in position on winders fall mainly into three categories:

(a) Guide strips positioned on the Winder vertical frame at each end of the coreshaft to provide vertical channels in which the coreshaft ends are located as they move upwardly as the roll diameter increases.

This arrangement is not too satisfactory as the coreshaft ends are not actually fixed in relation to the winder but are free to move in a vertical direction and also to embody a degree of lateral end play.

(b) Coreshaft boxes mounted for vertical movement on the Winder vertical frame and embodying upright or inverted semi-circular bearing brackets for supporting the coreshaft bearings. The bearings are retained in the semi-circular bearing brackets by means of caps or latches which may be spring loaded to facilitate opening. The caps or latches are held in the closed positions by spring loaded clamping means and are shaped as, or equipped with, handle means for opening thereof.

` These arrangements are also unsatisfactory as the coreshaft bearing housings are not clamped tightly and thus rotate in the semi-circular bearing brackets causing wear and subsequent looseness. The bearings also have sufficient play within the coreshaft boxes to bounce about under conditions of severe Winder vibration causing the latch or cap clamping means to open, especially when the cap and clamping springs lose their resiliency.

(c) Arrangements using upright or inverted semicircular bearing brackets and embodying bearing cap means, or pivotally mounted latch means, which are opened and closed by hydraulic cylinders. In -the closed positions, the hydraulic cylinders `are able to exert suffi- 3,301,498 Patented Jan. 31, 1967 ICC cient force upon the coreshaft bearings to prevent the housings rotating within the boxes, however, this arrangement requires a supply of high pressure hydraulic fluid which is not always readily available at the location of the Winder or rewinder, and also the provision of hydraulic cylinders, as well as the supply of high pressure hydraulic fluid, adds considerably to the initial cost of the equipment.

It is, therefore, another object of this invention to provide an improved latch mechanism for releasably clamping coreshaft bearings in coreshaft bearing boxes in which the mechanism incorporates a manually operated toggle device for applying a high load on the bearing clamping means, Without the need for a supply of high pressure hydraulic fluid and hydraulic equipment.

Another object of this invention is to provide an improved coreshaft bearing box latch mechanism which exerts an effective clamping load on the coreshaft bearing housing, and is positively locked in position, Without the need for the use of springs.

A further object of this invention is to provide an improved coreshaft bearing box latch mechanism including a manually operated toggle linkage and incorporating a release device for easily and rapidly tripping the toggle linkage away from its locked position and thus releasing the coreshaft from the bearing box.

The basic form of this invention achieves these objectives by the provision of a vertically movable semicircular bearing bracket for supporting each of the coreshaft bearings and including a latch pivotally mounted on the bearing bracket. The end of the latch on one side of the latch fulcrum is formed to provide a coreshaft bearing housing engaging surface and the end on the other side of the latch fulcrum is operatively connected to the bearing bracket by means of-a two link toggle device. One of the toggle links is formed to include an operating handle and the two links are arranged to exert maximum load on the end of the latch, and thus the bearing housing, when they assume a straight line configuration. The links are allowed to move beyond the straight line configuration to provide a positive locked configuration of the links, and stop means are provided to limit this movement. Adjustable means are incorporated in the stop means, and in the toggle links, to obtain an optimum condition of maximum latch load together with positive locking of the toggle links yin this condition.

The foregoing and other objects and advantages of this invention will be further apparent by reference to the following detailed specification and figures, in which:

FIG. 1 is a side elevation of a slitter-winder incorporating coreshaft bearing box latch mechanisms according to this invention.

FIG. 2 is a front elevation of the slitter-winder shown in FIG. 1.

FIG. 3 is a side elevation of the latch mechanism shown in FIG. 1, but to an enlarged scale and embodying a toggle release device.

FIG. 4 is a front elevation of the latch mechanism shown in FIG. 3.

FIG. 5 is a side elevation, similar to FIG. 3, but showing the latch mechanism in the unlatched position.

FIG. 6 is a side elevation, similar to FIG. 3, but embodying an adjustable toggle link and an adjustable toggle stop means. Y

FIG. 7 is a partial side view, similar to FIG. 6, but showing the toggle linkage aligned for adjustment of the linkage locking load and coreshaft clamping load.

Referring now to FIGS. 1 and 2, coreshaft bearing boxes 11 are shown supported for vertical movement on vertical frame members 12 of slitter-winder 13.

The paper 14, which is to be slit and wound, passes over draw table 15, during which stage it passes through slit- 3 ters 16 which are spaced across slitter-winder 13 and adjusted to slit the paper into the required widths. Paper 14, now slit, then passes around support drum 17 and is wound onto coreshaft 18 to form wound roll 19. Support drum 17, together with support drum 20, rotatably support wound roll 19.

Support drums 17 and 20 are both driven at constant speed by shafts 21 and 22, respectively, and thus wound roll 19 is driven, by surface contact with drums 17 and 20, at constant winding speed. Rider rolls 23 are rotatably positioned above, and `on the centerline of, wound roll 19, and are adapted to be lowered into contact with wound roll 19 and to move vertically therewith to provide support during winding.

Referring to FIGS. 3, 4 and 5, coreshaft bearing box 11 is shown slidably mounted in vertical ways 24, on vertical frame member 12, and includes inverted U shaped bearing bracket anges 25. One end of coreshaft 18 is rotatably mounted in a shouldered bearing housing 26 by means of tapered roller bearing, or the like, and the other end is rotatably mounted in a shoulderless sleeve bearing housing by needle rollers, or thel like. The reduced diameter portion 27, of shouldered bearing housing 26, is located between inverted U shaped bearing bracket flanges 25, and thus the transverse positioning of coreshaft 18 is effectively controlled.

Referring particularly to FIG. 3, shouldered bearing housing 26 is securely and non-rotatably clamped between inverted U shaped bearing bracket flanges 25 by a latch 28, which is pivotally mounted between inverted U shaped flanges 25 by fulcrum pin 29. The end 30 of latch 28, on one side of fulcrum pin 29, is formed to engage the reduced diameter portion 27, of shouldered bearing housing 26, and the end on the other side of fulcrum pin 29 is pivotally connected, by pivot pin 31, to short toggle link 32. They other end of short toggle link 32 is pivotally connected, by toggle joint pivot pin 33, to one end of long toggle link 34. The other end of long toggle link 34 is pivotally connected to a lug 35, on bearing box 11, by means of pivot pin 36.

The geometric arrangement of lug 35 with respect to inverted U shaped flanges 25 is such that the end 30, of latch 28, will exert a maximum clamping force on reduced diameter portion 27, positioned within flanges 25, when pivot pins 31, 33 and 36, are positioned to lie in a straight line 37.

In order to securely lock latch 28 in this clamping position, toggley joint pivot pin 33 is moved to a point beyond straight line 37, until stop face 38, on short toggle link 32, abutts the surface of long toggle link 34, see FIG. 3. In this locked configuration toggle joint pivot pin 33,`having moved beyond straight line 37, will now be subject to the full clamping force which will urge stop face 38 against long toggle link 34, whilst end 30 of latch 28 will still exert substantially the same clamping force against reduced diameter portion 27. Thus short and long toggle links 32 and 34, respectively, will remain in the locked configuration until a large force is exerted to overcome the force urging stop face 38 against long toggle link 34, and toggle joint pivot pin 33 is returned to, and moved to the other side of, straight line 37, whereupon the same force will cause the toggle linkage to fly open and release bearing housing 26, see FIG. 5. The toggle linkage will fall open until latch 28 makes contact with point 39 on bearing box 11.

Handle 40 is provided as part of, or attached to, short toggle link 32, in order to facilitate manual opening and closing of the toggle linkage device.

The leverage and inertia obtained by hand operation of lever 40 enables an operator to easily close the latch and toggle linkage device without necessitatnig the use of a large force, however, a much greater force is required to overcome the locking force and to open the toggle linkage device. While this opening force may be readily Aexerted by the operator, the preferred execution of this (g. invention embodies a toggle release device which enables the locked toggle linkage to be flipped open without the exertion of any large force.

The toggle release device comprises a release handle 41 which is pivotally mounted through flanges 25, and a release lever 42 which is positioned between anges 25 and securely mounted on release handle 41 to rotate therewith.

FIGURES 3 and 4 show the toggle linkage in a locked configuration and release lever 42 lying adjacent the toggle joint between short and long toggle links 32 and 34, respectively. It will thus be seen that anti-clockwise rotation of release handle 41 will cause lever 42 to move toggle joint pivot pin 33 to the other side of straight line 37 and thus the linkage will fly open and assume the released configuration shown in FIG. 5. The ease with which the release device may be operated is due to the favourable mechanical advantage ratio between handle 41 and lever 42.

FIG. 6 shows a side elevation, similar to FIG. 3, but in which a turnbuckle 43 is substituted for long toggle link 34, and in which an adjustable stop means is provided, to obtain an optimum condition of maximum latching load together with a securely locked toggle linkage.

FIG. 7 shows a partial side View, similar to FIG. 6, but illustrating the method used for adjustment to obtain the optimum condition, which is as follows:

Pivot pins 31, 33 and 36, are positioned to lie` along straight line 37. This is the position in which maximum load is imposed by latch 28 on reduced diameter portion 27. Turnbuckle lock nuts 44 are loosened and the turn-l buckle adjusted until the desired latching load is obtained, lock nuts 44 are then retightened.

Then stop lock nut 45 is loosened and stop screw 46 adjusted to provide the required clearance 47, which will permit secure locking of the toggle linkage without substantially reducing the latching load.

It will be understood that the above disclosed means of adjustment are shown by way of example only and that many other adjusting means could be incorpo-rated into this invention, such as eccentric pivot pin mountings.

It will also be understood that many other geometric arrangements of toggle linkage and lat-ch can be embodied to fall within the basic concept of this invention, which is a pivotally mounted latch adapted to exert latching load by means of a lockable toggle linkage.

From the foregoing it is thus seen that an improved manually operated coreshaft latching mechanism, according to this invention, achieves all of the objects and advantages as set forth.

What I claim is:

1. In a Winder for paper machines employing a coreJ shaft for winding paper thereon having a bearing and bearing housing means positioned adjacent the ends thereof, mounting frame members having mounting bracket means positioned thereon to receive the coreshaft bearing housing means, and pivotal latch means for releasably clamping the coreshaft bearing housing in the mounting bracket means, a toggle linkage mechanism including first and second pivotally connected toggle links operatively connected thereto to provide clamping force of the latch means against the bearing housing means when in a substantially straight-line configuration and including stop means positioned to limit the movement of the toggle linkage mechanism on one side of said substantially straightline configuration, when in the clamping position, the improvement comprising a movable release handle mounted on said Winder adjacent the linkage pivot connection of said toggle linkage mechanism, having a substantially rigid release lever portion for 4releasing displacement of the linkage pivot connection from Said stop means and past said substantially straight-line configuration to an unlocked position, whereby said pivotal latch means is released from Clamping engagement with the bearing housing, to permit ready removal of the bearing housing from the Winder.

2. A Winder as set forth in claim 1 in Which said stop means includes an adjustable stop screw positioned in said first toggley link connected to said mounting bracket means and adapted to abut a stop face on said second toggle link connected to said latch means.

3. A Winder for paper machines employing a coreshaft for Winding paper thereon and having end bearing and bearing housing means, including a vertical mounting frame positioned on each side of said Winder, a mounting bracket positioned for vertical sliding movement on each of said vertical mounting frame members, said mounting brackets including inverted U-shaped bearing brackets, and means for releasably clamping said coreshaft bearing and bearing housing means in said U-shaped bearing brackets, said clamping means including latch means pivotally mounted on each of said U-shaped bearing brackets and adapted to clampingly engage said bearing housing means thereagainst, and a toggle linkage operably connected between each mounting bracket and the latch means mounted thereon, the fulcrum of said latch means being positioned between the portion of said latch means engaging said bearing housing means and the connection to said toggle linkage means, said toggle linkage means including a pair of pivotally connected toggle links, the rst toggle link of said pair being pivotally connected to said latch means and embodying a handle means and the second toggle link of said pair being pivotally connected to said mounting bracket means and including an adjustable turnbuckle, said second toggle link being longer than said rst toggle link, said toggle linkage means adapted to exert clamping force on said bearing housing means through said latch means when said toggle linkage means is positioned substantially in a straight line, and an adjustable stop screw positioned in said second toggle link and adapted to abut a stop face on said iirst toggle link to limit the movement of said toggle linkage means on one side of said substantially straight-line conguration.

4. A Winder as set forth in claim 3 including a release handle pivotally mounted on each of said inverted U- shaped bearing brackets, and a release lever nonrotatably mounted on each release handle, said release lever posi-f tioned to be adjacent the pivotal connection between said rst and second toggle links When said stop screw is abutting said stop face, said release lever adapted to rotate and move said toggle linkage means to the other side of said substantially straight-line conguration When said release handle is rotated.

References Cited by the Examiner UNITED STATES PATENTS 2,505,425 4/1950 Newell 292-196 X 2,733,019 l/ 1956 Goodwillie 242-66 2,960,277 ll/ 1960 Moser 242--66 FRANK I. COHEN, Primary Examiner.

W. S. BURDEN, Examiner. 

1. IN A WINDER FOR PAPER MACHINES EMPLOYING A CORESHAFT FOR WINDING PAPER THEREON HAVING A BEARING AND BEARING HOUSING MEANS POSITIONED ADJACENT THE ENDS THEREOF, MOUNTING FRAME MEMBERS HAVING MOUNTING BRACKET MEANS POSITIONED THEREON TO RECEIVE THE CORESHAFT BEARING HOUSING MEANS, AND PIVOTAL LATCH MEANS FOR RELEASABLY CLAMPING THE CORESHAFT BEARING HOUSING IN THE MOUNTING BRACKET MEANS, A TOGGLE LINKAGE MECHANISM INCLUDING FIRST AND SECOND PIVOTALLY CONNECTED TOGGLE LINKS OPERATIVELY CONNECTED THERETO TO PROVIDE CLAMPING FORCE OF THE LATCH MEANS AGAINST THE BEARING HOUSING MEANS WHEN IN A SUBSTANTIALLY STRAIGHT-LINE CONFIGURATION AND INCLUDING STOP MEANS POSITIONED TO LIMIT THE MOVEMENT OF THE TOGGLE LINKAGE MECHANISM ON ONE SIDE OF SAID SUBSTANTIALLY STRAIGHTLINE CONFIGURATION, WHEN IN THE CLAMPING POSITION, THE IMPROVEMENT COMPRISING A MOVABLE RELEASE HANDLE MOUNTED ON SAID WINDER ADJACENT THE LINKAGE PIVOT CONNECTION OF SAID TOGGLE LINKAGE MECHANISM, HAVING A SUBSTANTIALLY RIGID RELEASE LEVER PORTION FOR RELEASING DISPLACEMENT OF THE LINKAGE PIVOT CONNECTION FROM SAID STOP MEANS AND PAST SAID SUBSTANTIALLY STRAIGHT-LINE CONFIGURATION TO AN UNLOCKED POSITION, WHEREBY SAID PIVOT LATCH MEANS IS RELEASED FROM CLAMPING ENGAGEMENT WITH THE BEARING HOUSING, TO PERMIT READY REMOVAL OF THE BEARING HOUSING FROM THE WINDER. 